A production line cooling device based on diurnal temperature difference change

Abstract

The application discloses a production line cooling device based on day and night temperature difference change, relates to the technical field of production line waterway, and comprises a cooling tower, a heat exchanger and a Roots blower, the bottom end of the cooling tower is provided with a first water storage pool and a second water storage pool, the first water storage pool is located above the second water storage pool, a pipeline pump is installed on the cooling tower, the pipeline pump is communicated with the bottom end of the second water storage pool through a pipeline pump water inlet pipe, and the pipeline pump is communicated with a spray head located at the top end in the cooling tower through a pipeline pump water outlet pipe. The application adopts two-way water sending switching design, switches according to the demand based on the demand of the production line in summer / winter or daytime / night, carries out secondary cooling treatment on the liquid through the serpentine pipeline in high load, prolongs the cooling time of the liquid, reduces the length of the liquid passing through the pipeline in low load, guarantees the stability of the siphon, and the two-way switching cooperation ensures that energy is not wasted, and the energy-saving and consumption-reducing effect is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of production line waterway, and particularly relates to a production line cooling device based on diurnal temperature variation. BACKGROUND

[0002] At present, the powder food processing industry generally adopts Roots blower positive pressure conveying to convey materials, such as in the sections of base powder into the warehouse, powder mixing, packaging, and circulating warehouse. Compared with the traditional mechanical bucket elevator or screw auger, the positive pressure conveying has the advantages of flexible warehouse switching, multi-point unloading, no residue, and closed conveying. However, the Roots blower positive pressure conveying uses two blades in the Roots blower to continuously convey air from one side to the other side to form a high-pressure conveying gas. In the process of gas extrusion, the temperature rise increases with the increase of the compression ratio. When the Roots blower pressure increases by 30-98 kPa and the ambient temperature is 10-40℃, the exhaust temperature rises by about 6℃ for every 10kPa increase in exhaust pressure, and the exhaust temperature rises by about 11℃ for every 10℃ increase in ambient temperature. In particular, the exhaust temperature of the Roots blower can reach 70-90℃ in summer, and high temperature is not conducive to the storage of wheat flour quality. At present, the processing industry has not formed a unified standard solution to the high temperature problem of positive pressure conveying. Small manufacturers do not have obvious needs due to product structure, and the investment in transformation is limited, so they basically do not process. Medium and large processing plants have paid more and more attention, and have adopted various ways to achieve uneven results, without forming an automatic control closed loop.

[0003] At present, the water temperature of the production line is controlled at 24-28℃, which is reasonable. Usually, a cooling tower is used to reduce the water temperature. However, due to seasonal changes and diurnal temperature variation, at least 1 / 3 of the time is prone to waste. Therefore, a production line cooling device based on diurnal temperature variation is needed to perform energy-saving modification on the existing production line. SUMMARY

[0004] The purpose of the present application is to solve the above problems, and a production line cooling device based on diurnal temperature variation is proposed.

[0005] In order to achieve the above purpose, the present application adopts the following technical scheme:

[0006] A production line cooling device based on diurnal temperature variation, comprising a cooling tower, a heat exchanger, and a Roots blower, wherein the Roots blower is connected with a gas conveying pipe, the heat exchanger is installed on the gas conveying pipe, the heat exchanger has a heat exchanger water inlet pipe connected with a heat exchanger inlet port, and the heat exchanger has a heat exchanger outlet pipe connected with a heat exchanger outlet pipe.

[0007] The bottom end of the cooling tower is provided with a first water storage pool and a second water storage pool, the first water storage pool is located above the second water storage pool, a water supplement pipe is installed on the second water storage pool, a fifth electromagnetic valve is installed on the water supplement pipe, a pipeline pump is installed on the cooling tower, the pipeline pump is communicated with the bottom end of the second water storage pool through a pipeline pump water inlet pipe, and the pipeline pump is communicated with a spray head located at the top end in the cooling tower through a pipeline pump water outlet pipe;

[0008] The inner bottom end of the first water storage pool is provided with a water outlet pipe, the water outlet pipe extends into the cooling tower and is communicated with a serpentine pipeline, one end of the serpentine pipeline away from the water outlet pipe is communicated with a heat exchanger water inlet pipe, and the heat exchanger water outlet pipe extends into the second water storage pool and is communicated with a drain pipe.

[0009] Optionally, a bypass pipe is further included, two ends of the bypass pipe are communicated with the water outlet pipe and the heat exchanger water inlet pipe respectively, the water outlet pipe and the heat exchanger water inlet pipe are both provided with a first electromagnetic valve at one end close to the serpentine pipeline, and the bypass pipe is provided with a second electromagnetic valve;

[0010] The heat exchanger water outlet pipe is communicated with the pipeline pump water inlet pipe, a third electromagnetic valve is installed on one end of the heat exchanger water outlet pipe close to the pipeline pump water inlet pipe, a fourth electromagnetic valve is installed on the drain pipe, and a sixth electromagnetic valve is installed on one end of the pipeline pump water inlet pipe away from the pipeline pump.

[0011] Optionally, an electronic thermometer is installed on the heat exchanger water inlet pipe, and a temperature and humidity sensor is installed on the pipe wall of the gas conveying pipe;

[0012] The pipeline pump, the heat dissipation fan, the Roots blower, the electronic thermometer, the temperature and humidity sensor, the first electromagnetic valve, the second electromagnetic valve, the third electromagnetic valve, the fourth electromagnetic valve, the fifth electromagnetic valve and the sixth electromagnetic valve are all electrically connected with a PLC controller.

[0013] Optionally, the serpentine pipeline is composed of a fixed pipe, a connecting bearing, a rotating pipe, a transmission wheel and a transmission belt.

[0014] The fixed pipe is composed of a straight pipe and a U-shaped pipe, and both are fixedly connected to the tower body of the cooling tower, the rotating pipe is a straight pipe, and the rotating pipe is rotatably connected to the fixed pipe through the connecting bearing and is communicated.

[0015] The number of the transmission wheels is two, one of the transmission wheels is made of a heat-conducting material and is seamlessly welded on the rotating pipe, the other transmission wheel is connected to the first water storage pool, and a transmission belt made of a memory alloy material is jointly sleeved on the two transmission wheels.

[0016] Optionally, a gear set is arranged between the rotating pipes, and the rotating pipes are drivingly connected through the gear set.

[0017] Compared with the prior art, the present application has the following advantages:

[0018] This invention employs a dual-flow water supply switching design, which switches on demand based on the needs of the production line in summer / winter or day / night. Under high load, the liquid undergoes secondary cooling through a serpentine pipeline, extending the cooling time. Under low load, the length of the pipeline through which the liquid passes is reduced, ensuring the stability of the siphon. After modifying the existing production line, the dual-flow switching ensures that energy is not wasted and achieves energy saving and consumption reduction.

[0019] In summer or when the production line is operating at high load during the day, a high-load water circulation design is adopted. The liquid is directly circulated through the pipeline as cooling water, requiring only one water storage tank. This avoids the problem of liquid evaporation caused by multiple water storage tanks. At the same time, only one pipeline pump is needed to complete the transportation of circulating water.

[0020] When the production line is operating at low load in winter or at night, a siphon plus pipeline pump auxiliary water supply design is adopted. It utilizes the liquid level difference and atmospheric pressure. Water can be drawn through the pipeline pump and replenished when the first water tank is low. The pipeline pump can be turned down or started intermittently, which greatly reduces the energy consumption of the pipeline pump. It is suitable for low-load production or low ambient temperature scenarios.

[0021] This invention further utilizes the waste heat on the serpentine pipe and, through the cooperation of a transmission belt and transmission wheel made of shape memory alloy, can convert thermal energy into the kinetic energy of the serpentine pipe's rotation. This allows both the upper and lower sides of the serpentine pipe to have better contact with the sprayed liquid, thereby increasing the cooling effect of the cooling tower on the circulating water inside the serpentine pipe without increasing energy consumption. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 This is a PLC connection control diagram for the present invention;

[0024] Figure 3 This is a diagram showing the operation of the pipeline during summer and high daytime loads according to the present invention;

[0025] Figure 4 This is a diagram illustrating the low-load pipeline operation during winter and at night according to the present invention.

[0026] Figure 5 This is a schematic diagram of the structure of Embodiment 2 of the present invention;

[0027] Figure 6 For the present invention Figure 5 A sectional view taken along the centerline AA;

[0028] Figure 7 This is a schematic diagram of the structure of Embodiment 3 of the present invention.

[0029] In the diagram: 1 Cooling tower, 2 First water storage tank, 3 Second water storage tank, 4 Pipeline pump, 5 Heat dissipation packing, 6 Cooling fan, 7 Water collector, 8 Spray head, 9 Serpentine pipe, 91 Fixed pipe, 92 Connecting bearing, 93 Rotating pipe, 94 Gear set, 95 Transmission wheel, 96 Transmission belt, 10 Electronic thermometer, 11 First solenoid valve, 12 Second solenoid valve, 13 Outlet pipe, 14 Heat exchanger inlet pipe, 15 Heat exchanger outlet pipe, 16 Third solenoid valve, 17 Fourth solenoid valve, 18 Drain pipe, 19 Makeup pipe, 20 Fifth solenoid valve, 21 Temperature and humidity sensor, 22 Gas transmission pipe, 23 Heat exchanger, 24 Roots blower, 25 Sixth solenoid valve, 26 Bypass pipe. Detailed Implementation

[0030] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0031] Example 1

[0032] Reference Figure 1 A production line cooling device based on diurnal temperature variation includes a cooling tower 1, a heat exchanger 23, and a Roots blower 24.

[0033] The Roots blower 24 is connected to a gas supply pipe 22, and the heat exchanger 23 is installed on the gas supply pipe 22. The liquid inlet port of the heat exchanger 23 is connected to a heat exchanger water inlet pipe 14, and the water outlet pipe of the heat exchanger 23 is connected to a heat exchanger water outlet pipe 15. In this embodiment, the diameter of the heat dissipation pipe inside the heat exchanger 23 is smaller than that of the heat exchanger water inlet pipe 14, which can achieve a local pressurization effect. By reducing the pipe diameter, the fluid velocity at that location is increased.

[0034] The cooling tower 1 is provided with a cooling fan 6, a water collector 7, a spray head 8, cooling packing 5, and a water storage tank from top to bottom. In this embodiment, there are two water storage tanks, as follows:

[0035] The cooling tower 1 is provided with a first water storage tank 2 and a second water storage tank 3 at its bottom. The first water storage tank 2 is located above the second water storage tank 3. The two water storage tanks, which are set up above and below each other, can create a height difference, providing a foundation for the subsequent pipeline siphon.

[0036] A water supply pipe 19 is installed on the second water storage tank 3, and a fifth solenoid valve 20 is installed on the water supply pipe 19. A pipeline pump 4 is installed on the cooling tower 1. The pipeline pump 4 is connected to the bottom end of the second water storage tank 3 through the pipeline pump inlet pipe, and the pipeline pump 4 is connected to the spray head 8 located at the top of the cooling tower through the pipeline pump outlet pipe.

[0037] The bottom of the first water storage tank 2 is provided with a water outlet pipe 13. The water outlet pipe 13 extends into the cooling tower 1 and is connected to a serpentine pipe 9. The end of the serpentine pipe 9 away from the water outlet pipe 13 is connected to the heat exchanger inlet pipe 14. The heat exchanger outlet pipe 15 extends into the second water storage tank 3 and is connected to a drain pipe 18.

[0038] In this embodiment, a bypass pipe 26 is further provided. The diameter of the bypass pipe 26 should be reduced to reduce the liquid flow rate. The two ends of the bypass pipe 26 are connected to the outlet pipe 13 and the heat exchanger inlet pipe 14, respectively. A first solenoid valve 11 is provided at the end of the outlet pipe 13 and the heat exchanger inlet pipe 14 near the serpentine pipe 9. A second solenoid valve 12 is provided on the bypass pipe 26.

[0039] The heat exchanger outlet pipe 15 is connected to the pipeline pump inlet pipe. A third solenoid valve 16 is installed at the end of the heat exchanger outlet pipe 15 near the pipeline pump inlet pipe. A fourth solenoid valve 17 is installed on the drain pipe 18. A sixth solenoid valve is installed at the end of the pipeline pump inlet pipe away from the pipeline pump 4.

[0040] Reference Figure 2 In this embodiment, an electronic thermometer 10 is installed on the heat exchanger inlet pipe 14, and a temperature and humidity sensor 21 is installed on the wall of the gas delivery pipe 22. The pipeline pump 4, cooling fan 6, Roots blower 24, electronic thermometer 10, temperature and humidity sensor 21, first solenoid valve 11, second solenoid valve 12, third solenoid valve 16, fourth solenoid valve 17, fifth solenoid valve 20, and sixth solenoid valve 25 are all electrically connected to a PLC controller.

[0041] The principle of this invention is as follows:

[0042] Reference Figure 3 During summer or when the production line is operating at high load during the day, first close the second solenoid valve 12 on the bypass pipe 26, and then open the fifth solenoid valve 20 to send soft water, deionized water, distilled water, etc. into the second water storage tank 3 through the water supply pipe 19. Next, close the third solenoid valve 16 and start the pipeline pump 4. The pipeline pump 4 drives the liquid to spray out from the spray head 8 and fall into the first water storage tank 2 for pre-cooling. When a certain amount of water has accumulated in the first water storage tank 2, open the third solenoid valve 16 and temporarily close the sixth solenoid valve 25. At this time, the first... The liquid in the water storage tank 2 is sent back into the pipeline pump 4 for circulation through the outlet pipe 13, the serpentine pipe 9, the heat exchanger inlet pipe 14, the heat exchanger 23, and the heat exchanger outlet pipe 15. Finally, it is sprayed out through the spray head 8 to cool the serpentine pipe 9 and the liquid. At this time, the cooling fan 6 should also be turned on to prevent excessive moisture in the cooling tower 1 from preventing the liquid from evaporating. In summary, in summer or when the production line is running at high load during the day, the second water storage tank 3 only plays the role of replenishing water and prevents the liquid from entering the second water storage tank 3 and evaporating and wasting.

[0043] Reference Figure 4 In winter or at night when the production line is operating at low load or intermittently, the two first solenoid valves 11 at the upper end of the bypass pipe 26 are closed first, so that the liquid enters the outlet pipe 13 and is sent directly into the heat exchanger inlet pipe 14 without passing through the serpentine pipe 9. This arrangement makes the outlet pipe 13, the bypass pipe 26 and the heat exchanger inlet pipe 14 form a siphon pipe. Next, the siphon needs to be primed. As above, close the third solenoid valve 16, open the water supply pipe 19 to deliver water, and spray the liquid into the first water storage tank 2 through the pipeline pump 4. When a certain amount of water has accumulated in the first water storage tank 2, open the third solenoid valve 16 and close the sixth solenoid valve 25. At this time, the liquid in the first water storage tank 2 enters the heat exchanger outlet pipe 15 through the outlet pipe 13, bypass pipe 26, heat exchanger inlet pipe 14, and heat exchanger 23. At this time, the priming is completed. Close the third solenoid valve 16 and open the fourth solenoid valve 17. The liquid continuously siphons in from the outlet pipe 13 and is discharged from the drain pipe 18. It is only necessary to install a level gauge in the first water storage tank 2, and open the pipeline pump 4 and the sixth solenoid valve 25 when the liquid level is low to pump the liquid in the second water storage tank 3 into the cooling tower 1 for cooling and to replenish the first water storage tank 2.

[0044] In this embodiment, the inner diameter of the bypass pipe 26 is smaller than that of the outlet pipe 13, so that there is a diameter difference between the bypass pipe 26 and the outlet pipe 13. This can prevent the siphon from being interrupted. When the liquid enters the bypass pipe 26, it will continue to move a distance towards the first solenoid valve 11 under the action of inertia before rebounding. This reduces the diameter of the bypass pipe 26, so that the liquid saturates and fills the outlet pipe 13 up to the first solenoid valve 11. This prevents the liquid column from breaking, which reduces the force between the liquid molecules on both sides of the break to zero, which is much smaller than the pumping capacity of the pipeline pump 4. Therefore, the pipeline pump 4 only needs to be turned on once every once in a while to replenish the water in the first water storage tank 2.

[0045] Example 2

[0046] Reference Figure 5 and Figure 6 This embodiment improves the serpentine pipe 9, thereby utilizing heat energy and converting it into the kinetic energy of the rotating pipe 93, allowing the upper and lower ends of the pipe to circulate in contact with the spray water, as detailed below:

[0047] The serpentine pipe 9 consists of a fixed pipe 91, a connecting bearing 92, a rotating pipe 93, a drive wheel 95, and a drive belt 96. The fixed pipe 91 is composed of a straight pipe and a U-shaped pipe, both of which are fixedly connected to the tower body of the cooling tower 1. The rotating pipe 93 is a straight pipe, and it is rotatably connected to and communicates with the fixed pipe 91 via the connecting bearing 92. It is worth mentioning that the drive belt 96 passes through the heat dissipation packing 5 with gaps.

[0048] There are two drive wheels 95. One drive wheel 95 is made of a heat-conducting material and is seamlessly welded to the rotating tube 93. The heat-conducting material can be copper, aluminum, etc., which have good thermal conductivity. The other drive wheel 95 is connected to the first water storage tank 2. Both drive wheels 95 are fitted with a drive belt 96 made of shape memory alloy, which can be titanium-nickel alloy wire or alloy belt. The drive belt 96 can be replaced when it is fatigued and damaged.

[0049] The principle of this embodiment is as follows:

[0050] When the temperature of the rotating tube 93 in the serpentine pipe 9 rises, the rotating tube 93 transfers the temperature to the thermally conductive transmission wheel 95, and finally to the transmission belt 96 at that point. Since the transmission belt 96 is made of shape memory alloy and the contact surface with the transmission wheel 95 is a curved surface, it will return to a straight shape when heated. However, due to the constraint of the transmission wheel 95, the transmission belt 96 drives the transmission wheel 95 to rotate under the action of friction, thereby ultimately realizing the rotation of the rotating tube 93. When the transmission belt 96 moves to the bottom, it can be cooled by cooling water for secondary heating.

[0051] In this embodiment, each rotating tube 93 is connected to a transmission belt 96 to drive its rotation individually.

[0052] Example 3

[0053] Reference Figure 7 The difference between this embodiment and embodiment 2 is that a gear set 94 is provided between the rotating tubes 93, and the rotating tubes 93 are connected by the gear set 94.

[0054] Because of the transmission connection between the rotating tubes 93, only one transmission belt 96 is needed to drive all the rotating tubes 93 to rotate, thereby reducing the number of transmission belts 96 used and greatly reducing the replacement cost when they are fatigued and damaged.

[0055] The above description is only a preferred embodiment of the present invention. It is impossible to exhaustively describe all embodiments here. However, the protection scope of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the technical scope disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the protection scope of the present invention.

Claims

1. A production line cooling device based on diurnal temperature variation, comprising a cooling tower (1), a heat exchanger (23), and a Roots blower (24), wherein the Roots blower (24) is connected to a gas supply pipe (22), the heat exchanger (23) is installed on the gas supply pipe (22), the liquid inlet port of the heat exchanger (23) is connected to a heat exchanger water inlet pipe (14), and the liquid outlet port of the heat exchanger (23) is connected to a heat exchanger water outlet pipe (15), characterized in that: The cooling tower (1) is provided with a first water storage tank (2) and a second water storage tank (3) at its bottom. The first water storage tank (2) is located above the second water storage tank (3). A water supply pipe (19) is installed on the second water storage tank (3). A fifth solenoid valve (20) is installed on the water supply pipe (19). A pipeline pump (4) is installed on the cooling tower (1). The pipeline pump (4) is connected to the bottom of the second water storage tank (3) through the pipeline pump inlet pipe. The pipeline pump (4) is connected to the spray head (8) located at the top of the cooling tower through the pipeline pump outlet pipe. The bottom of the first water storage tank (2) is provided with a water outlet pipe (13), which extends into the cooling tower (1) and is connected to a serpentine pipe (9). The end of the serpentine pipe (9) away from the water outlet pipe (13) is connected to the heat exchanger inlet pipe (14), and the heat exchanger outlet pipe (15) extends into the second water storage tank (3) and is connected to a drain pipe (18).

2. The production line cooling device based on diurnal temperature variation according to claim 1, characterized in that, It also includes a bypass pipe (26), the two ends of which are connected to the outlet pipe (13) and the heat exchanger inlet pipe (14) respectively. The outlet pipe (13) and the heat exchanger inlet pipe (14) are each equipped with a first solenoid valve (11) at the end near the serpentine pipe (9), and a second solenoid valve (12) is provided on the bypass pipe (26). The heat exchanger outlet pipe (15) is connected to the pipeline pump inlet pipe. A third solenoid valve (16) is installed at the end of the heat exchanger outlet pipe (15) near the pipeline pump inlet pipe. A fourth solenoid valve (17) is installed on the drain pipe (18). A sixth solenoid valve is installed at the end of the pipeline pump inlet pipe away from the pipeline pump (4).

3. A production line cooling device based on diurnal temperature variation according to claim 2, characterized in that, An electronic thermometer (10) is installed on the heat exchanger inlet pipe (14), and a temperature and humidity sensor (21) is installed on the pipe wall of the gas transmission pipe (22). The pipeline pump (4), cooling fan (6), Roots blower (24), electronic thermometer (10), temperature and humidity sensor (21), first solenoid valve (11), second solenoid valve (12), third solenoid valve (16), fourth solenoid valve (17), fifth solenoid valve (20) and sixth solenoid valve (25) are all electrically connected to a PLC controller.

4. A production line cooling device based on diurnal temperature variation according to claim 1, characterized in that, The serpentine pipe (9) consists of a fixed pipe (91), a connecting bearing (92), a rotating pipe (93), a transmission wheel (95), and a transmission belt (96); The fixed pipe (91) consists of two parts: a straight pipe and a U-shaped pipe, both of which are fixedly connected to the tower body of the cooling tower (1). The rotating pipe (93) is a straight pipe, and the rotating pipe (93) is rotatably connected to the fixed pipe (91) through a connecting bearing (92) and is in communication with it. There are two drive wheels (95). One drive wheel (95) is made of heat-conducting material and is seamlessly welded to the rotating tube (93). The other drive wheel (95) is connected to the first water storage tank (2) by a shaft. The two drive wheels (95) are fitted with a drive belt (96) made of shape memory alloy.

5. A production line cooling device based on diurnal temperature variation according to claim 4, characterized in that, A gear set (94) is provided between the rotating tubes (93), and the rotating tubes (93) are connected by the gear set (94).

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